From 2004 to 2009 he wrote a column for the online version of The Washington Post called White House Watch and was the Senior Washington Correspondent for the Huffington Post.[4]
On June 18, 2009 it was reported that his blog would cease to exist and his employment at The Washington Post was terminated. In July, 2009, he was hired by the Huffington Post.[5]

Froomkin's brother is University of Miami Law Professor Michael Froomkin, a prominent blogger who writes on Florida politics and the law.

In her editorial "The Two Washington Posts", published on December 11, 2005, Washington PostOmbudsmanDeborah Howell observes that the print newspaper The Washington Post and the website washingtonpost.com are two different entities; although "The Post Web site is owned by the Washington Post Co....it is not run by the newspaper. It is a separate company called Washington Post-Newsweek Interactive, or WPNI, with offices in Arlington."[6] Whereas "The Post provides the vast majority of the Web site's content...the Web site has its own staff of 65 editorial employees and its own features.... [Moreover,] [t]here are cultural differences between the two newsrooms, which could be expected between a traditional newspaper and the more free-wheeling Web site....The two Posts interact every day.... [but] political reporters at The Post don't like WPNI columnist Dan Froomkin's "White House Briefing," which is highly opinionated and liberal. They're afraid that some readers think that Froomkin is a Post White House reporter."[6]

Howell continues:

John Harris, national political editor at the print Post, said, "The title invites confusion. It dilutes our only asset—our credibility" as objective news reporters. Froomkin writes the kind of column "that we would never allow a White House reporter to write. I wish it could be done with a different title and display."

Harris is right; some readers do think Froomkin is a White House reporter. But Froomkin works only for the Web site and is very popular—and [Executive Editor of the website Jim] Brady is not going to fool with that, though he is considering changing the column title and supplementing it with a conservative blogger.

Froomkin said he is "happy to consider other ways to telegraph to people that I'm not a Post White House reporter. I do think that what I'm doing, namely scrutinizing the White House's every move—with an attitude—is in the best traditions of American and Washington Post journalism."

On the other hand, Chris Cillizza, a washingtonpost.com political reporter, appears in The Post frequently. When he writes for the paper, he works for Harris, who is happy to have him.[6]

There was some support from reader for Froomkin in editorial correspondence about the matter.[7]

On January 30, 2007, White House Briefing was renamed White House Watch.

Froomkin is also deputy editor of Nieman Watchdog: Questions the press should ask, a blog hosted by the Nieman Foundation for Journalism at Harvard University that, according to his account of it, "seeks to encourage more informed reporting by soliciting probing questions from experts."[8]

On June 18, 2009, it was reported that Froomkin was being fired by the Washington Post.[9][10] Froomkin confirmed this in a June 19 entry on White House Watch: "As Washington Post ombudsman Andy Alexander and others reported yesterday, The Washington Post has terminated my contract. So sometime in late June or early July, I'll be writing my last blog post here."[11]

Froomkin was almost immediately hired by the Huffington Post, where he continued his previous column. His last original column for that publication was September 25, 2013.